Transmission Fluid (ATF)

The Hydra-Matic 6L80 requires the use of DEXRON®-VI ATF. DEXRON®-VI significantly improves fluid viscosity, shift performance and fluid durability. GM tests have demonstrated that DEXRON®-VI delivers more than twice the durability and stability in friction tests compared to existing fluids. DEXRON®-VI has also demonstrated superior performance in pitting, foaming, oxidation and shear stability tests.

How to check the fluid level:

Bring the transmission fluid temperature between 86º– 122ºF (30º–50ºC). You can verify this using a scan tool, the driver information center, or the transmission gauge.

• Park the vehicle on level ground.
• Start the engine and let it idle.
• Shift the transmission through each range, pausing in each range for about 3 seconds to give the clutches a chance to fill.
• Place the transmission in park.
• Remove the level control plug located in the transmission oil pan. The fluid should drip out the level control hole. If so, the fluid level is okay.

• If fluid doesn’t drip from the level control hole,add Dexron VI until fluid starts to drip from the hole.
• If fluid runs from the hole, wait until the fluid stops running out to lower the fluid to the proper level.

The level is correct when fluid drips from the hole. If a steady stream is present or no flow is present the fluid level is incorrect. Readjust the fluid level, and reinstall the fill plug and the level control plug.

You can add fluid through the dipstick hole or through the level control hole.